Wash the potatoes and cook in boiling water for about 20 minutes. In the meantime drain the sauerkraut. Peel onion and cut into fine strips. Heat the oil in a pot and sauté the onion. Add sauerkraut, deglaze with stock and stew covered for about 20 minutes. Season with salt and pepper. Drain and halve the apricots.
Drain potatoes, rinse and peel. Scoop out some of the potatoes with a teaspoon. Mix sauerkraut with apricots and fill the potatoes with it. Put the potatoes in a roaster. Put the rest of the sauerkraut and apricots with the potato pieces in the roaster and spread about 2/3 of the sour cream on top. Braise in the preheated oven (electric cooker: 200 °C/ gas: level 3) for about 20 minutes. Spread the rest of the sour cream as a blob on the potatoes, dust with paprika and serve garnished with marjoram